package XueXi;

public class Demo02 {
    public static void main(String[] args) {
        /*
        求出 1 - 1/2 + 1/3 - 1/4 + 1/5 ....
         */

        double sum = 0;
        for (int i = 1;i <= 100;i++){
            if (i % 2 == 0){  //分母为偶数
                sum = sum - (1.0/i);
            }else{
                sum = sum + (1.0/i);
            }
        }
        System.out.println("sum=" + sum);
    }
}
